Bug 30068: Remove table_settings_borrowers_table from circulation.tt

Bug 30068: Remove table_settings_borrowers_table from circulation.tt

The history is a mess, but here we init a JS variable that is never
used.

Test plan:
  git grep table_settings_borrowers_table
should not return anything after this patch applied

Signed-off-by: Caroline Cyr La Rose <caroline.cyr-la-rose@inlibro.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit e90cba4e3819fd244e9397fec6c1bc0c4984690d)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>